/**
* Copyright (C) 2008 Happy Fish / YuQing
*
* FastDFS Java Client may be copied only under the terms of the GNU Lesser
* General Public License (LGPL).
* Please visit the FastDFS Home Page http://www.csource.org/ for more detail.
*/

package com.hlf.common.oss.fastdfs;

import java.io.IOException;
import java.lang.reflect.Array;

/**
* C struct body decoder
* @author Happy Fish / YuQing
* @version Version 1.17
*/
public class ProtoStructDecoder<T extends StructBase>
{
/**
* Constructor
*/
    public ProtoStructDecoder()
    {
    }

/**
* decode byte buffer
*/
    public T[] decode(byte[] bs, Class<T> clazz, int fieldsTotalSize) throws Exception
    {
        if (bs.length % fieldsTotalSize != 0)
        {
            throw new IOException("byte array length: " + bs.length + " is invalid!");
        }

        int count = bs.length / fieldsTotalSize;
        int offset;
        T[] results = (T[])Array.newInstance(clazz, count);

        offset = 0;
        for (int i=0; i<results.length; i++)
        {
            results[i] = clazz.newInstance();
            results[i].setFields(bs, offset);
            offset += fieldsTotalSize;
        }

        return results;
    }
}
